Well-drilling bit



Sept. 21 1926. 1,600,265

w. T. w'QoDs WELL DRILLING BIT Filed April 28, 1924 1 vlam* l Strom/LW Patented Sept. .#21, 1926.

UNITED STA-T ESY PATENT OFFICE.

WALTER T. WOODS, F LONG BEACH, CALIFORNIA, ASSIGNOR TO U. S. `'JIOOL COMPANY, 4 0F LONG BEACH, CALIFORNIA, A CORPORATION 0F CALIFORNIA.

WELL-DRILLING Brr.

I Application led April 28, 1924. Serial No. 709,413.

This invention relates to weil driuing bits and' refers particularly to the typeof Well bits emplo ing a rotary disc cutter for use in the hy raulic rotary system of drilling wells.

The disc bits heretofore employed in drillf' ing oil wells have hada' tendency to lose one or more ottheir rotary cutters fro'mthe bit during the drilling operation with the result that suchy cutter becomes lodged in the bottom ot the Well ,Where it is extremely diiiicult to remove the same from the well.

vAn object of the present invention is-to provide a disc bit with certain nvel means or locking the rotary cutters to the bit so 1. that 4such dangerof the cutters being lost,

from the bit may be eliminated.

Various other objects and advantagesy ofthe present invention lwill be apparent from a descriptionof the preferred embodiment of the invention for which purpose reference is made to the accompanying drawings which illustrate oneexample or embodiment of the invention.

' In the drawings:-

Eigure 1 is a vertical .elevation ofthe preferred form of well bit.

Fig. 2 is a vsimilar elevation at right angles to Fig. 1.

Fig. Slis an enlarged elevation of the low-V er end ofthe well bit.

Fig. 4 is a transverse section on the line 4-4 of Fig. 3; and i l jFig. 5 is ,-a section on eferring to the drawin s, the Well bit comprises an elongated bo y l having an enlargement 2 near its upper end and terminating in` a tapered pin 3 by which the bit may be attached to a stand of drill rod and rotated during the drilling operations. The body 1 is provided with opposed legs 4 extending'below the/major'portion of the body, the legs 4 being bent forwardly in the direction of vrotation ofthe bit and preferathe line Y 5-5 of bly bowed slightly inward-as indicated in i Fig. 2. Each leg serves to mount a disc cutter 5 'disposed between the legs and mounted thereon in planes which converge below the and divide material'forced upwardbetween aXially through the body 1 of the bit an 'di'schargin from. an

enlargement 8 between the two e ges 6. i

Each of the, discs 5 are mounted upon a4 i bushing 9 which is heldto the body by a' pin 10 inserted through the'outer side of the legs 4 and having an end extending beyond the inner side of the llegs and there screw'- threaded to the bushingv9 as indicated at 11. Each bushing 9 is provided with an outturned' annular flange 12 one end spaced trom the leg 4 supporting the bushing, said flange 12 fitting in a complementary recess 13 on the inner side of the disc cutter 5. 1-4 indicates a dogfitted into the leg 4 and extending into arecess 15 in the bushing 9, the pin thus serving to lock the ybushing 9 from rotating with the rotation ot the disc cutter 16 indicates a washer or wearplate between the disc cutter 5 and leg 4, the washer 16 preferably being set partly.

into the body as-indicated in Fig. 5.

At its outer end `the pin 10 is pro!l vided with ahead 17 and the leg 4`is provided with a recess 1810i suilicient depth that the head'17 doesn'ot project beyond the normal outer wall .of the leg 4. The head 17 ofthe pin isnyprovided with .a n'umber of notches or recesses 19 spaced at intervals around the `'peripheraledge of the head. 20 indicates a lock member carrying a plurality of lugs 21 whiclrare designe 1 to fit in a plurality of therecesses ornotches 19 in the head of the pin 10, tle lock member 20 having an extension 22 which its in la radial extension of the recess 18 in the leg 4 and is therel held to the leg 4 by` means of a screw 23er similar means. The look member 20 is generally shaped to conform with the adjacent walls ofthe recess 18 of the leg 4 to be held thereby from movement in the leg 4.v

Preferably the bushing 9 which. mounts the cutter 5 isv fitted into a recess. 24 on the inner side of the leg so that such bushing 9 may supplement the pin.l0in resisting the force tending to shear'the cutterL 5 from the..Y

leg 4 during drilling operations.4

Thelock member 2O carrying a plurality ofV lugs or equivalent devices for engaging.

the plurality of recesses-er notches on the pin 10 of the bitwill be found 'to be esf pecially "effective in preventing such pin from rotating out of the leg 4 of the bit and Will thus positivelyY hold the mounting means Aof the disc about thel bit and insure the disc cutter 5 being held to the bit throughout all drilling operations.

Vhile the embodiment of the invention herein described is Well suited for the purposes of this invention, it is not intended to limit the invention to t-he particular embodiment shown and the invention 'is of the scope set forth in the appended claims.

I claim 1. A- rotary disc bit for Well drilling comprising a body, a plurality of disc cutters, and means rotatably mounting the disc. cutters on the body, said means including a pin,

a bushing carried by the pin, means for.

for each cutter, a bushing carried by each pin,'n'1eans for preventing the bushing revolving on the pin, an arcuate recess in the body adjacent said pin, the recess-having an outward radial extension,v and a lock member in said recess and having a reduced eX- tension fitted in the extension of said recess, said locl: member and pin having a lookin(lr engagement adapted to prevent rotation or the pin.

3. A rotary dise bit for well drilling comprising a body, a plurality of disc cutters and means rotatably mounting the disc cutters on the body, said means including a pin, a bushing carried. by the pin, means foi preventing the bushing revolving on the pin, a recess in the body adjacent the pin, a reduced part of the recess extending outward from the side of the pin, and a lock member havin an enlarged portion fitting the main bo 'y of the recess and a laterally extended portion -projecting into the reduced part of said recess, said member having locking engagement with the pin and operative to prevent rotation thereof.

4. A rotary disc bit for well drilling, comprising a body, a plurality of disc cutters,- and means for rotatably mounting the disccutters on the body, said means inV cluding a load transferring member carried by the pin and disposed to transfer part of the load from the pin to the body, means for preventing such member rotating relai tive to the pin, an arcuate recess 1n the body.

adjacent the pin, a reduced part of there cess extending outward from the side of the pin, and a locking member held in such recess and having a locking engagement with the mounting means to prevent rotation thereof.

5. A rotary disc bit for well drilling, comprising a body, a plurality'of disc cutters,

means for mounting the disc cutters on the body, an arcuate recess in the body adjacent said mounting means, areduced part of said recess extending outwardly from the side of the mounting means, and a locking member held in such recess and having two spaced apart locking portions for forming a locking engagement with said mounting means.

(i. A rotary disc bit for well drilling comprising a body, a plurality of disc cutters, means for rotatively mounting the disccutters on the body, said means including a member carried by the pin engaging the body for assisting the pin in carrying the drilling load, means to prevent rotation of said member, an arcuaterecess in the body adjacent the pin, a reduced'part of 'the recess extending outwardly from the 'side of the pin, and a locking member held in such recess and having a plurality of spaced locking lugs engaging a part of a plurality vof circumferentially disposed recesses provided by the cutter mounting means and operated thereby to preyent rotation of the cutter mounting means.

Signed at Los Angeles, Californiathis 19th day of April, 1924.

vYVALTER vT. WOODS. 

